Most interesting, Peter. Thanks for collating all that info!!
Actually I don't have a Canon 2xTC, but a Tamron F 1.4. But I'm
planning on eventually getting the Tamron Pro 1.4 and 2x, so the
compatability thing is moot. But like I said, the bucks ain't there
right now anyway! When they are, I'm still really on the fence about
what combination to go with, as has been lengthily discussed here.
And of course there are other qualities besides sharpness to
consider...
Ken
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